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Lee, Donghwa,Lee, Hyungjin,Ahn, Yumi,Jeong, Youngjun,Lee, Dae-Young,Lee, Youngu RSC Pub 2013 Nanoscale Vol.5 No.17
<P>A new AgNW-graphene hybrid transparent conducting electrode (TCE) was prepared by dry-transferring a chemical vapor deposition (CVD)-grown monolayer graphene onto a pristine AgNW TCE. The AgNW-graphene hybrid TCE exhibited excellent optical and electrical properties as well as mechanical flexibility. The AgNW-graphene hybrid TCE showed highly enhanced thermal oxidation and chemical stabilities because of the superior gas-barrier property of the graphene protection layer. Furthermore, the organic solar cells with the AgNW-graphene hybrid TCE showed excellent photovoltaic performance as well as superior long-term stability under ambient conditions.</P>
Lee, Yongwon,Lee, Tae Kyung,Kim, Saehun,Lee, Jeongmin,Ahn, Youngjun,Kim, Koeun,Ma, Hyeonsu,Park, Gumjae,Lee, Sang-Min,Kwak, Sang Kyu,Choi, Nam-Soon Elsevier 2020 Nano energy Vol.67 No.-
<P><B>Abstract</B></P> <P>Li metal anodes and Ni-rich layered oxide cathodes with high reversible capacities are promising candidates for the fabrication of high energy density batteries. However, low Coulombic efficiency, safety hazards from likely vertical Li growth, and morphological instability of Ni-rich cathodes hinder the practical applications of these electrodes. Here, we report that fluorinated compounds can be employed as interface modifiers to extend the applicable voltage range of ether-based electrolytes, which have been used specifically so far for lithium metal batteries with charging cut-off voltages lower than 4 V (vs. Li/Li<SUP>+</SUP>). A complementary electrolyte design using both 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether and fluoroethylene carbonate in concentrated ether-based electrolytes significantly improves the capacity retention (99.1%) in a Li|LiNi<SUB>0.8</SUB>Co<SUB>0.1</SUB>Mn<SUB>0.1</SUB>O<SUB>2</SUB> full cell, with a high Coulombic efficiency of 99.98% after 100 cycles at 25 °C. Thus, the modified electrolyte system is promising for addressing the reductive and oxidative decompositions of labile ether-based electrolytes in high energy density Li metal batteries with Ni-rich cathodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ether-based electrolyte formulation for 4V-class Li metal batteries is presented. </LI> <LI> FEC and TTE are employed as the electrode–electrolyte interface modifiers. </LI> <LI> Fluorine-enriched interfaces enable high-performance Li metal batteries. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
2-Propanol as a co-guest of structure II hydrates in the presence of help gases.
Lee, Youngjun,Lee, Seungmin,Park, Sungwon,Kim, Yunju,Lee, Jong-Won,Seo, Yongwon American Chemical Society 2013 The journal of physical chemistry. B, Condensed ma Vol.117 No.8
<P>The enclathration of 2-propanol (2-PrOH) as a co-guest of structure II (sII) hydrates in the presence of CH4 and CO2 was experimentally verified with a focus on macroscopic phase behaviors and microscopic analytical methods such as powder X-ray diffraction (PXRD) and NMR spectroscopy. 2-PrOH functioned as a hydrate promoter in the CH4 + 2-PrOH systems, whereas it functioned as an apparent hydrate inhibitor in the CO2 + 2-PrOH systems despite the inclusion of 2-PrOH in the hydrate lattices. From the PXRD patterns, both double CH4 + 2-PrOH and double CO2 + 2-PrOH hydrates were identified to be cubic (Fd3m) sII hydrates. From the (13)C NMR spectra, it was found that, at a lower 2-PrOH concentration, the small 5(12) cages of the sII hydrate were occupied by CH4 molecules only, whereas the large 5(12)6(4) cages were shared by CH4 and 2-PrOH molecules. However, at a stoichiometric concentration, the large cages were occupied by 2-PrOH molecules only, and the corresponding chemical formula for this concentration is 1.50CH40.98 2-PrOH17H2O.</P>
Organic Photovoltaics with Non-Stoichiometric InZnSnO Thin Film Cathodes
Lee, Hye Ji,Noviyana, Imas,Koo, Chang Young,Lee, Jung-A,Kim, Jeong-Joo,Lestari, Annisa Dwi,Jeong, Youngjun,Lee, Youngu,Lee, Hee Young American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.7
<P>Non-stoichiometric indium zinc tin oxide (IZTO) thin films were deposited onto glass substrates at 400 degrees C by DC magnetron sputtering using non-stoichiometric (In0.5Zn0.25-xSn0.25+xO1.5 and In0.4Zn0.3-xSn0.3+xO1.5, where x = +/- 0.05) IZTO ceramic targets. After deposition, all of the films were given annealing treatment at 450 degrees C in argon. The crystallization behavior was examined by X-ray diffraction, while the optical properties were measured by ultraviolet-visible spectroscopy, in which the average transmittance values higher than 80% were observed from all films. The minimum resistivity of approximately 6.3x10(-4) Omega center dot cm was observed from the Sn-rich In0.5Zn0.2Sn0.3O1.5 film. The resistivity values of Sn-rich IZTO thin films were a little smaller than those of Zn-rich IZTO films. An OPV cell with the so-called inverted structure was fabricated using various IZTO films deposited under optimized conditions as the cathode electrode. It was found that the solar cell efficiency could reach up to 7.9% which is the same with the OPV cell with conventional ITO film.</P>
TBAF 혼합 Semi-Clathrate의 열역학적 특성분석
이영준(Lee, Youngjun),이승민(Lee, Seungmin),박성민(Park, Sungmin),이종운(Lee, Jongwoon),서용원(Seo, Yongwon) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
본 연구는 최근 하이드레이트와 유사한 형태인 semi-clathrate 형성을 통해 열역학적 촉진제로서 주목받고 있는 TBAF(Tetra-n-butyl ammonium fluoride)의 가스 하이드레이트 형성에 작용하는 영향을 알아보았다. TBAF를 10, 33.8, 45 wt%의 농도로 CH₄+H₂O, CO₂+H₂O, N₂+H₂O계에 첨가하여 가스 하이드레이트 3상 평형점(하이드레이트(H) - 물(Lw) - 기상(V)) 측정을 하였다. TBAF가 첨가된 경우 순수한 CH₄, CO₂, N₂ 가스 하이드레이트보다 평형조건이 더 높은 온도와 더 낮은 압력 영역에서 나타났으며 기체의 종류와 무관하게 TBAF의 농도가 33.8 wt%일 때 10, 45 wt%보다 뛰어난 촉진효과를 갖고 있음을 확인할 수 있었다. 이를 통해 양론비인 TBAF의 농도 33.8 wt% 이상에서는 반응을 하지 않고 남아있는 TBAF가 하이드레이트 생성반응에 방해요소로 작용하는 것을 알 수 있었다. 본 실험에서 얻어진 결과 TBAF를 촉진제로서 사용하는 가스 하이드레이트 공정이라면 33.8 wt% 농도의 사용이 가장 효과적일 것으로 사료된다.
정영준(Youngjun Jung),황현선(Hyunsun Hwang),이창기(Changki Lee) 한국정보과학회 2020 정보과학회논문지 Vol.47 No.9
언어 생성(language generation) 작업에서는 Sequence-to-Sequence 모델을 이용하여 자연어를 생성하는 딥러닝 기반의 모델이 활발히 연구되고 있으며, 기존에 문서에서 핵심 문장만 추출(extractive)하는 방식을 사용하였던 문서 요약 분야에서도 생성(abstractive) 요약 연구가 진행되고 있다. 최근에는 BERT와 MASS 같은 대용량 단일 언어 데이터 기반 사전학습(pre-training) 모델을 이용하여 미세조정(fine-tuning)하는 전이 학습(transfer learning) 방법이 자연어 처리 분야에서 주로 연구되고 있다. 본 논문에서는 MASS 모델을 이용하여 한국어 언어 생성을 위한 사전학습을 수행한 후 이를 한국어 문서 요약에 적용하였다. 실험 결과, MASS 모델을 이용한 한국어 문서 요약 모델이 기존 모델들보다 높은 성능을 보였고, 추가로 MASS 모델에 상대 위치 표현 방법을 적용하여 문서 요약 모델의 성능을 개선하였다. In the language generation task, deep learning-based models that generate natural languages using a Sequence-to-Sequence model are actively being studied. In the field of text summarization, wherein the method of extracting only the core sentences from the text is used, an abstract summarization study is underway. Recently, a transfer learning method of fine-tuning using pre-training model based on large amount of monolingual data such as BERT and MASS has been mainly studied in the field of natural language processing. In this paper, after pre-training for the Korean language generation using MASS, it was applied to the summarization of the Korean text. As a result of the experiment, the Korean text summarization model using MASS was higher performance than the existing models. Additionally, the performance of the text summarization model was improved by applying the relative position representation method to MASS.
실사고 데이터를 이용한 EES에 따른 인체상해도 경향성 분석
이승상(Seungsang Lee),송영준(Youngjun Song),윤영한(Younghan Youn),이재완(Jaewan Lee),김시우(Siwoo Kim),이강현(Kanghyun Lee),이희영(Heeyoung Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Currently frontal crash safety evaluation is conducted by crashing a vehicle against a rigid barrier in Korea. It evaluate crash performance of a vehicle in a barrier test in terms of vehicle stiffness and strength. But this method is basic test. Probably, This test isn’t matched in Real World Crash Collision about occupant injury. So The availability of in-depth accident data is prerequisite for each efficient traffic safety management system. In this study, As using photo modeler program, It finds out relationship between occupant injury based on AIS and Estimated Energy Equivalent Speed in the real world in-depth accident data and compares crashing a vehicle test against a rigid barrier by using Madymo to Estimated Energy Equivalent Speed in the Real World in-depth accident data. Using Real World in-depth accident data is essential part of improving vehicle safety and reduction of traffic fatality in Korea.